Convert cups to US gallons

1 cup=0.0634gal (US)

Use the converter below to change any cups value into US gallons instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.063401

Conversion formula

Forward

US gallons = cups × 0.0634

Reverse

cups = US gallons × 15.7725

Example: 10 cup × 0.0634 = 0.634 gal (US).

About both units

From

Cup

cup

The US cup equals 240 millilitres in common usage (legally defined as 236.588 ml). The metric cup (Australia, NZ) is 250 ml; the UK "cup" is 284 ml but rarely used in recipes. Cooking recipes from the US dominate online, so 240 ml is the safe default for "cup".

Real-world: 1 cup of water = 240 g = 240 ml. 1 cup of all-purpose flour weighs about 125 g. A Starbucks Tall is 12 fl oz = 1.5 cups.

Read full cup reference →

US Gallon

gal (US)

The US gallon equals 3.785411784 litres exactly. It is the standard fuel and liquid volume unit in the United States. A typical American car holds 14–18 US gallons of fuel. US fuel economy is quoted in miles per US gallon (mpg).

Real-world: US car tank ≈ 15 gallons (57 L). 1 US gallon of milk is a common grocery size (3.79 L). US paint often sold by the gallon.

Read full us gallon reference →

Cup to US Gallon conversion table

Common cups to US gallons values for quick reference.

Cup (cup)	US Gallon (gal (US))
1 cup	0.0634 gal (US)
2 cup	0.1268 gal (US)
5 cup	0.317 gal (US)
10 cup	0.634 gal (US)
20 cup	1.26803 gal (US)
50 cup	3.17006 gal (US)
100 cup	6.34013 gal (US)
200 cup	12.6803 gal (US)
500 cup	31.7006 gal (US)
1,000 cup	63.4013 gal (US)

Tips & common mistakes

Quick tips

US cup = 240 ml common; 236.6 ml legal; UK cup = 284 ml; metric cup (AU/NZ) = 250 ml.
Weights (grams) are more reliable than cups — a cup of flour can vary 30% depending on how packed.
For baking, always use the recipe author's country convention.

Avoid these

Using a UK 284 ml cup for a US recipe calling for 240 ml — 18% overshoot.
Treating all dry ingredients as 1 cup = 240 g — only true for water.
Using a coffee mug as a "cup" — mugs vary 200–400 ml.

Frequently asked questions

How many US gallons in a cup?

One cup equals 0.0634 US gallons.

How do I convert cups to US gallons?

Multiply the cup value by 0.0634 to get the equivalent in US gallons.

What is 100 cups in US gallons?

100 cups equals 6.34013 US gallons.

Is a cup bigger than a us gallon?

No. 1 cup equals 0.0634 US gallons, so one cup is smaller.

How to convert cups to US gallons without a calculator?

Multiply by 0.06 for a quick estimate; use a calculator for precise results.

Related volume conversions

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Convert cups to US gallons

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